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It does positive work. There's 2 ways to look at this:
1) This one's a chemistry way. When work is done on a system by the surroundings, the work is positive. When the system itself is doing work on the surroundings, this is negative work. Just think of it in terms of the system. It gains energy when something does work to it and loses energy when it works on something else. Based on this, do you think it's positive or negative work?
2) This one's a physics way. W = Fd cos (theta). In this equation, W = work, F = a force, d = displacement, and theta = angle between the force and the displacement. So, let's take the example of a falling object. As it falls, the force of gravity is exerting a force towards the ground. The object is moving towards the ground also. Since both the directions are the same, theta is 0 and work is + (cos of angle 0 is +1). When the object is moving upward while gravity is acting on it, exerting a downward force, the angle between them is 180 degrees. At 180 degrees, cos is -1. Work done by gravity is negative in this case.
Either ways, positive work is being done by gravity on the falling object.
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Is gravitational force positive or negative?
Gravity force is always downward and it depends how you define the coordinate system. By convention down is negative, but that is only a general rule
What are positive negative and neutral buoyancies?
Positive buoyancy . . .When the object is completely submerged, the net force on it ... the combinationof gravity down and buoyancy up ... is upward, so the object tries to rise.Negative buoyancy . . .When the object is completely submerged, the net force on it ... the combinationof gravity down and buoyancy up ... is downward, so the object tries to sink.Neutral buoyancy . . .When the object is completely submerged, the net force on it ... the combinationof gravity down and buoyancy up ... is zero. The object stays at whatever depthit is released, without rising or sinking.
Which object weighs approximately 1 newton?
The weight of an average apple is around one Newton. Rather appropriate when you consider that it was a falling apple that made Newton think about gravity.
Does a book falling from a shelf have gravitational energy?
Yes; while on the shelf it has potential energy due to gravity of mgh where m = mass and g =gravity acceleration and h is height fom floor. As it falls its potential energy is converted to kinetic energy mv squared/2 where v = velocity
How do you make an object 'jump' in a Game Maker game?
The easiest way to jump is by entering this code in the correct places. You could set the gravity but this way is easier. This will work in both the pro and lite put this code in you Create event of you player falling=false; //Variable for Falling hitting=false; //Variable for if you are hitting something grav=7; //Gravity movement=6; //Speed at which you move jump=0; //Used for jumping jumping=false; //If you are jumping or not space=false; //if space is pressed doublejumping=false //if doublejumping doublej=0; //for doublejumping put this code in you step event of you player //FALLING: if(!collision_point(x,y,ground,true,false) && !jumping && !doublejumping) //not touching ground, or jumping{ y+=grav; //Move down the number gravity grav=7; //Keeps gravity set falling=true; //says the player is falling } if(keyboard_check_pressed(vk_space)){ //if keypressed SPACE space=true //space=true. For other purposes } if(keyboard_check_released(vk_space)){ //if space not pressed space=false //space is false } if(space=true && jumping==false) //if space is pressed, and jumping is false{ jumping=true; //jumps space=false //space no longer pressed } if(space=true && jumping==true && doublejumping=false) //if space pressed, player jumping, and not doublejumping { doublejumping=true //doublejumps jumping=false //no more jumping } if(jumping) //if jumping is true{ y-=jump; //go up jump jump-=.5; //lower jump a little if(jump<0) && doublejumping=false //if jump is nil and not doublejumping { falling=true; //fall } if(jump<-10) { //if jump is below -10, set it to 10 jump=-10; } } if(doublejumping) //if doublejumping{ y-=doublej; //go up doublej doublej-=.5; //lower doublej a little if(doublej<0) { //is doublej is nil, fall falling=true; } if(doublej<-10) { //if doublej is below -10, set it to -10 doublej=-10; } } if(collision_point(x,y,ground,true,false) && falling) { //if touching ground and falling jump=10; //jump is 10, for next jump jumping=false; //No longer jumping falling=false; //no longer falling doublejumping=false //no longer doublejumping } if(keyboard_check(vk_left)) { //MOVEMENT. if left key is pressed x-=movement; //move left } if(keyboard_check(vk_right)) { //if right pressed x+=movement; //move right } if falling=false && jumping=true { //if falling is false, and jumping is true { doublej=10; //doublej is 10 } } Done. if you r having trouble download the example http://www.willhostforfood.com/users/warsome/doublejumpgrav.gmk
